Suction attachment for dental plates.



PATENTED DEC. 5, 1905.

J.A.JOHINISON. SUCTION ATTACHMENT FOR DENTAL'PLATES.

APPLIGA'IION FILED SEPT. 16,1905.

Altomey UNITED STATES PATENT OFFICE. JOHN ALLEN .ioHNsoNbF MIDDLETOWN, DELAWARE. SUCTIONFATTACH'MENT FOR DENTAL PLATES.

Specification of Letters Patent.

Patented Dec. 5, 1905.

To aZZ whom it may concern.-

Be it known that I, JOHN ALLEN J OHNSON, a citizen of the United States, residing at Middletown, in the county of Newcastle and State of'Delaware, have invented certain new and useful Improvements in Suction Attachments for Dental Plates; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and

to the letters of reference marked thereon,

which form a part of this specification.

This invention relates to new and useful improvements in suction attachments for dental plates; and the object of the invention is to produce a simple and eflicient device of this character and comprises a flexible disk which will act automatically in permitting the egress and preventing ingress of air and avoiding distortion or the drawing down into the chamber of the plate of the soft mucous membrane of the roof of the mouth, thus preventing soreness of the mouth; and it consists, essentially, in the provision of a vulcanite plate having a recess in which an apertured metallic form is seated and having a flexible disk which is held in the form by its engagement with the peripheral margin of the opening in the form, leaving the outer part of the disk free and forming a lip or valve.

With my invention the free marginal edge of the flexible rubber disk, forming a lip, presenting away from the center of the chamber, or point where partial vacuum is desired, the application of exhaust will open the valve or lip and permit the escape of the contained air in the chamber, and instantly closing upon the stopping of the exhaust, being kept closed by atmospheric pressure.

' My invention is illustrated in the accompanying drawin s, which, with the letters of reference marke thereon, form a part of this application, and in which drawings- Figure 1 is a vertical sectional view through a vulcanite plate, showing applied thereto my suction appliance. Fig. 2 1s a top plan vlew of the invention. Fig. 3 is a perspec- .5 tive view of the metallic form having an aperture in its bottom to receive the flexible disk, and Fig. 4 is a perspective view of the flexible disk looking at the under surface of the same.

Reference now being had to the details of the drawings by letter, A designates a vulcanized plate of the usual construction,which is recessed at A upon its upper surface and adapted to receive a metallic form or receptacle B, which is fastened in any suitable manner to the plate by passing pins through apertures formed in the marginal edge of the form or receptacle.

C is a disk of flexible rubber, which is inserted through a central aperture D, formed in said metallic form, and a portion of said disk which when applied to the form .is in a plastic state is made to spread underneath the metal form about the central aperture therein and when the disk is hardened over a flange to securely hold the disk in place. The upperportion of said disk outsidethe marginal line of the aperture is of a flexible nature and forms a free lip or valve to permit the escape of contained air in the chamber and which will instantly close upon stopping the exhaust, it being kept closed by atmospheric pressure, thus acting automatically in permitting the egress of air and preventing the ingress of the same, and by this construction the vacuum-chamber exists only in theory and'by use of the appliance all distortion is prevented and the soft mucous membrane of the mouth protectedagainst soreness.

By the provision of an appliance as shown and descrlbed means is afforded whereby the disk may be easily and quickly removed in the case of any deterioration of the mate? rial and without in any way disturbing the suction of theremainin parts of the device.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A suction appliance for dental vulcanite plates comprising, in combination with an imperforate plate, having a recess in the surface thereof, a metallic form with an o ening therein seated'in said recess,'a flexib e disk having a shank portion which fills the opening in said plate and held to the latter, the

foo

marginal edges of the disk being free and serving as a valve or lip adapted to seat against said plate, as set forth.

2. A suction appliance for dental vuloanite plates, comprising, in combination with a plate having a recess upon the surface thereof, a metallic form seated in said recess, a flexible disk held to said form by a portion thereof engaging the under surface of the form about the central marginal aperture 10 therein, the outer portion of said disk forming a lip or valve, as set forth.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses. JOHN ALLEN JOHNSON. Witnesses:

JOHN B. COOKE, GEORGE D. KELLEY. 

